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MAX1993ETG Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1993ETG Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 36 page Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages _______________________________________________________________________________________ 7 ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 4) PARAMETER SYMBOL CONDITIONS MIN MAX UNITS INPUTS AND OUTPUTS Logic Input Threshold SHDN, SKIP, GATE rising edge, hysteresis = 225mV 1.20 2.20 V High 1.9 2.1 Dual Mode Threshold Voltage MAX1992 FB Low 0.05 0.15 V High VCC - 0.4V Open 3.15 3.85 REF 1.65 2.35 Four-Level Input Logic Levels TON, OVP/UVP, LSAT, FBLANK Low 0.5 V Note 2: When the inductor is in continuous conduction, the output voltage has a DC regulation level higher than the error compara- tor threshold by 50% of the output ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regulation level higher than the trip level by approximately 1.5% due to slope compensation. Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, VBST = 5V, and a 250pF capacitor connected from DH to LX. Actual in-circuit times can differ due to MOSFET switching speeds. Note 4: Specifications to -40°C are guaranteed by design, not production tested. Typical Operating Characteristics (MAX1992 Circuit of Figure 1, MAX1993 Circuit of Figure 9, VIN = 12V, VDD = VCC = 5V, SKIP = VCC, TON = open, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT (VOUT = 2.5V) LOAD CURRENT (A) 1 0.1 60 70 80 90 100 50 0.01 10 VIN = 7V VIN = 12V VIN = 20V SKIP = GND SKIP = VCC 2.5V OUTPUT VOLTAGE vs. LOAD CURRENT LOAD CURRENT (A) 4 3 1 2 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.47 05 SKIP = GND SKIP = VCC VIN = 7V VIN = 20V EFFICIENCY vs. LOAD CURRENT (VOUT = 1.8V) LOAD CURRENT (A) 1 0.1 60 70 80 90 100 50 0.01 10 VIN = 7V VIN = 12V VIN = 20V SKIP = GND SKIP = VCC |
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